The stipulation is the IP address is private which applies to both the 5 and 10 range. There is no difference in performance between them, but the purpose of the exercise in the example given in Danny’s example was to completely isolate the end point from any external traffic including remote access and internet access. I think Danny makes it clear he doesn’t think the extra isolation is significant in performance terms but what he suggests should work. If you have a working solution I doubt there is any point in changing it.